1

Clauss AdelineLy Nathalie

GE5S

GE III Project

January, 16th 2008

The altitude and speed measuring system of the drone

2Plan

Clauss AdelineLy Nathalie

GE5S

January, 16th 2008

1. Specifications of the project

2. Hardware design

3. Software development

4. Testing

5. Conclusions

3Part 1. Specifications of the project

The Drone

4Part 1. Specifications of the project

On-board electronics

Motors

Control

Speed sensor

Altitude sensor

MicrocontrollerPIC18F2520

DSP Data exchanges

and treatment chain

Inertial measurement unit

Rangefinder

GPS

Amplificationstage

5Part 2. Hardware design

Sensors choice

Atmospheric pressure sensorMPXA6115A by Freescale

+Differential pressure sensorMPXV5010DP by Freescale

Scale used : 0 < ΔP < 250 [Pa]

Scale used : 800 < P < 1100 [hPa]

Altitude range :0 < a < 200 [m]

Speed range :0 < a < 25 [m/s]

6

Amplification stage

Part 2. Hardware design

Speed sensor

Altitude sensor

18F2550

AD channel

AD channel

Vref- Vref+

Amplification

0.2V

to

0.4V

1.66V

to

4.86V

Amplification3.0V

to

4.5V

0.71V

to

4.89V

Vcc

6

Offset

Offset

Operational amplifiersMCP6144 by Microchip

7Part 2. Hardware design

PCB

Microcontroller

Supply stage

OAs

Amplification stage

Low-pass filter

Speed sensor

Altitude sensor

8Part 3. Software development

Means

MicrocontrollerPIC18F2520 by Microchip

Pickit2 Programmerby Microchip

programmation communication

9Part 3. Software development

Algorithms

Initializing µC A/D tool USART tool

A/D Conversionchannel 0 (speed)

Send data(speed)

Calculation(speed)

Getting reference P0

channel 1 (altitude)

A/D Conversionchannel 1 (altitude)

Send data(altitude)

Calculation(altitude)

10Part 4. Testing

• Determining OA real characteristics

Speed sensor characteristic :

11Part 4. Testing

• Determining sensors real characteristics

• Testing the software…

12Part 5. Conclusions

Technical conclusions

Fully working PCB

Positive ending

Cheap development

Work of research, prototyping and communication

Heavy problem for PCB printing

13Part 5. Conclusions

Personal conclusions

Promoting « Génie Electrique » to the Mechatronics

Improving our communication and self-control

Improving hardware debug abilities

14

Clauss AdelineLy Nathalie

GE5S

January, 16th 2008

Thank you for your attention